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NationBuilder's Co-Founder Joe Green announced Wednesday that he's stepping down from day-to-day operations at the company and joining the venture capital firm Andreessen Horowitz as an entrepreneur-in-residence.

Green had been the company's president. He didn't provide any specifics in his Facebook posting about his departure, but some of the work that he did, such as providing trainings to consultants and organizers, will be taken up by Michael Moschella, who joined the company late January as its vice president of organizing.

Moschella was last at the Truman National Security Project, where he was the group's National Political Director, where he trained various political candidates, and worked on foreign policy issues. He's also the Treasurer of the Board at the Netroots Foundation. Jim Gilliam will continue to serve as the head honcho and CEO of the company.